Lacking nothing—a prestigious family background, natural physical abilities, a thick thing down there—”Byungtae,” a fitness trainer, saw women only as fleeting distractions for temporary excitement. However, one day, a new personal training client, a married woman named “Seo Jihye,” appeared at his gym. Although he had always felt that getting involved with someone else’s woman would only bring trouble, Byungtae’s heart begins to waver in the face of Jihye’s charm… “Are you that lonely?” “Yes… I’m… very lonely…”.